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You should wait at least 24 hours for drywall mud to dry before sanding or applying another coat. However, the exact drying time depends on several factors, including the thickness of the application, room temperature, humidity, and the type of compound used. Thicker layers, or projects in high humidity, may require 48 hours or more. Lightweight compounds tend to dry faster than heavier, all-purpose ones. You'll know the mud is ready when it feels completely dry and firm to the touch and has changed to a consistent light color. Sanding too early can cause smudging or gouges, so patience is essential for a smooth finish.

When doing a DIY paint job, it can be tricky to achieve the perfect, straight line between your wall and ceiling. There are several methods, including lining it with painter’s tape and using the “cut in” brush tactic. Some homeowners choose to apply a thin line of caulk to the wall-ceiling seam to create the appearance of a perfect line.

A utility knife is sharp enough to score the drywall and it may work in a pinch for outlet box holes. However, one of the best tools for drywall when you need to make exact cuts for an outlet box quickly is a drywall saw. This handheld tool has a longer blade than a utility knife, so it penetrates the thickness of the drywall easily. The design of its handle and the teeth in its blade make it easier to control while cutting quicker than you can with a utility knife.

You should do a little bit of sanding between adding coats of mud. Knock down any ridges or significantly imperfect areas through sanding, which should help you apply the next coat of mud smoothly. If your first coat of mud is pretty smooth after it dries, a quick sanding is all you’ll need. Don’t forget to wipe away any dust after each sanding process.